Excellent Anti-Rust Performance
Marine engines are prone to rust, leading to uncontrolled wear and premature engine
failure. Good rust protection is not natural to motor oil; it comes only by design.
Formula 4-Stroke Marine Synthetic Motor Oil is fortified with a special anti-rust agent,
even more than required to pass stringent NMMA FC-W and FC-W Catalyst Compatible
anti-rust testing.

Note: AMSOIL Formula 4-Stroke Marine Synthetic 10W-40
is recommended for use in place of 25W-40 as specified
by Mercury®.

NMMA FC-W Catalyst Compatible • API SM

Service Life

Four-stroke outboard motors and personal watercraft applications: Due to
potential fuel dilution or water contamination, change oil at the engine or watercraft
manufacturer-recommended interval.

Inboard and I/O applications: Change oil at two times the engine manufacturer
recommended interval or one year, whichever comes first.

Compatibility
AMSOIL Formula 4-Stroke Marine Synthetic Motor Oil is compatible with conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oils, however, will shorten the oil's life expectancy and reduce the performance benefits. AMSOIL does not support extended drain intervals where oils have
been mixed.

Aftermarket oil additives are not recommended for use with
AMSOIL motor oils.

HEALTH & SAFETY
This product is not expected to cause health concerns when used for the intended
application and according to the recommendations in the Material
Safety Data Sheet (MSDS). USA and Canada (M)SDS are available upon request at 715-392-7101 or on the AMSOIL Website. Keep Out of Reach of Children. Recycle used oil and bottle.